A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica
The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The e...
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ftneicon:oai:rour.neicon.ru:rour/130770 2023-05-15T13:29:11+02:00 A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica Salamatin A. Ritz C. 1996 https://openrepository.ru/article?id=130770 unknown Annals of Glaciology X2 23 0260-3055 https://openrepository.ru/article?id=130770 SCOPUS02603055-1996-23-SID0030357378 Article 1996 ftneicon 2020-07-21T11:47:33Z The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The essential spatial non-uniformity of the accumulation rate and the resultant difference between central and coastal regions in reaction time-scales are taken into account. The dynamic interaction of the time-lagging interior with the quasi-stationary margin is described. As a result, a simplified model is deduced to simulate the surface-elevation variations in the central parts of the Antarctic ice sheet caused by mass-balance perturbations corresponding to the main Milankovich cycles with the periods of 19-100 kyears. Special computational tests are performed to validate the model through inter-comparison with the predictions obtained with a two-dimensional thermomechanical model. The sensitivity of the model to physical factors (represented by dimensionless tuning parameters) is discussed. Climatically controlled variations of the ice-sheet thickness in the vicinity of Vostok Station during the past 200 kyears are estimated. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet NORA (National aggregator of open repositories of Russian universities) Antarctic The Antarctic Vostok Station ENVELOPE(106.837,106.837,-78.464,-78.464) |
institution |
Open Polar |
collection |
NORA (National aggregator of open repositories of Russian universities) |
op_collection_id |
ftneicon |
language |
unknown |
description |
The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The essential spatial non-uniformity of the accumulation rate and the resultant difference between central and coastal regions in reaction time-scales are taken into account. The dynamic interaction of the time-lagging interior with the quasi-stationary margin is described. As a result, a simplified model is deduced to simulate the surface-elevation variations in the central parts of the Antarctic ice sheet caused by mass-balance perturbations corresponding to the main Milankovich cycles with the periods of 19-100 kyears. Special computational tests are performed to validate the model through inter-comparison with the predictions obtained with a two-dimensional thermomechanical model. The sensitivity of the model to physical factors (represented by dimensionless tuning parameters) is discussed. Climatically controlled variations of the ice-sheet thickness in the vicinity of Vostok Station during the past 200 kyears are estimated. |
format |
Article in Journal/Newspaper |
author |
Salamatin A. Ritz C. |
spellingShingle |
Salamatin A. Ritz C. A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
author_facet |
Salamatin A. Ritz C. |
author_sort |
Salamatin A. |
title |
A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
title_short |
A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
title_full |
A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
title_fullStr |
A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
title_full_unstemmed |
A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica |
title_sort |
simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central antarctica |
publishDate |
1996 |
url |
https://openrepository.ru/article?id=130770 |
long_lat |
ENVELOPE(106.837,106.837,-78.464,-78.464) |
geographic |
Antarctic The Antarctic Vostok Station |
geographic_facet |
Antarctic The Antarctic Vostok Station |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet |
op_source |
SCOPUS02603055-1996-23-SID0030357378 |
op_relation |
Annals of Glaciology X2 23 0260-3055 https://openrepository.ru/article?id=130770 |
_version_ |
1765999134943215616 |